| 摘要 |
PROBLEM TO BE SOLVED: To securely prevent contents even in a contents storage device with low capability from illegally being used. SOLUTION: A CPU selects contents stored in the contents storage device. In a step S202, the CPU verifies a 1st electronic signature added to the contents. A storage part stores a right to use. In a step S203, the CPU retrieves the right to use from the storage part. In a step S207, the CPU verifies a 2nd electronic signature added to the right to use. The CPU generates falsification detection data based upon information included in the right to use. In a step S208, the CPU outputs the use authorization, falsification detection data, and contents to the contents storage device on condition that neither the contents nor the right to use is falsified. This invention is applicable to a client of a DRM system. COPYRIGHT: (C)2004,JPO |
